EP2389333A1 - Elevator safety device - Google Patents

Elevator safety device

Info

Publication number
EP2389333A1
EP2389333A1 EP09840907A EP09840907A EP2389333A1 EP 2389333 A1 EP2389333 A1 EP 2389333A1 EP 09840907 A EP09840907 A EP 09840907A EP 09840907 A EP09840907 A EP 09840907A EP 2389333 A1 EP2389333 A1 EP 2389333A1
Authority
EP
European Patent Office
Prior art keywords
brake member
switch
braking position
housing
sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP09840907A
Other languages
German (de)
French (fr)
Other versions
EP2389333B1 (en
EP2389333A4 (en
Inventor
Anying Shen
William S. Mattox
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Otis Elevator Co
Original Assignee
Otis Elevator Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Otis Elevator Co filed Critical Otis Elevator Co
Publication of EP2389333A1 publication Critical patent/EP2389333A1/en
Publication of EP2389333A4 publication Critical patent/EP2389333A4/en
Application granted granted Critical
Publication of EP2389333B1 publication Critical patent/EP2389333B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
    • B66B5/16—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well
    • B66B5/18—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well and applying frictional retarding forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
    • B66B5/16—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well
    • B66B5/18—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well and applying frictional retarding forces
    • B66B5/22—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well and applying frictional retarding forces by means of linearly-movable wedges

Definitions

  • Elevator systems are useful for carrying passengers, cargo or both between various levels of a building.
  • the speed at which an elevator car moves depends upon operation of the machine (e.g., motor and brake). When the system is functioning as expected, machine operation results in a desired elevator car speed.
  • a governor will trigger a safety braking operation to bring the elevator car to a stop.
  • Elevator safety devices provide a braking function that is separate from the braking capability of the machine (e.g., the machine brake).
  • Such elevator safety devices typically include a brake member that directly engages a surface on the guiderails along which the elevator car moves.
  • One aspect of utilizing elevator safety devices for stopping the elevator car includes providing some indication that the safety device has engaged the guiderail. This is useful to initiate stopping the machine so that it does not attempt to continue to move the elevator car.
  • a switch and a cam attached to a moving part along the linkage that is associated with the governor for moving the braking element of the safety device into a braking position.
  • a switch may be attached to the crosshead of an elevator car frame with a cam bracket associated with a connecting rod that moves responsive to operation of the governor. As the governor rope pulls on the linkage to engage the safety braking element with the guiderail, the switch detects motion of the connecting rod of the linkage through the cam. In this manner the switch is able to provide a signal to the machine controller for stopping the machine.
  • An exemplary elevator safety device includes a housing.
  • a brake member is moveably supported by the housing for selective movement between a disengaged position and a braking position.
  • a sensor is supported by the housing and detects movement of the brake member into the braking position.
  • An exemplary method of monitoring an elevator safety device includes providing a sensor on the housing of the safety device. A determination is made when the brake member has moved into the braking position responsive to an indication from the sensor.
  • Figure 1 schematically illustrates selected portions of an elevator system.
  • FIG. 2 is a perspective illustration of an example elevator safety device designed according to an embodiment of this invention.
  • Figure 3 is a cross-sectional view taken along the lines 3-3 in Figure 2.
  • Figures 4A and 4B schematically illustrate two operating conditions of another example sensor device.
  • Figure 5 schematically illustrates another example sensor device.
  • FIG 1 schematically shows selected portions of an elevator system 20.
  • An elevator car 22 moves along guiderails 24 responsive to operation of a machine (e.g., motor and brake) (not illustrated).
  • Elevator guides 26 facilitate movement of the car 22 along the guiderails 24 in a known manner.
  • Elevator safety devices 30 are supported for movement with the elevator car 22 and are selectively operated to stop the elevator car 22.
  • one example safety device 30 includes a housing 32.
  • a brake member 34 is supported by the housing 32 so that the brake member 34 is selectively engaged with a corresponding portion of a guiderail 24 that is received within a channel 36 formed in the housing 32.
  • the brake member 34 follows a contour 38 formed on the housing 32 as the brake member 34 moves between a disengaged position in which the brake member 34 does not contact the guiderail 24 and a braking position in which the brake member 34 engages the guiderail 24 to cause the elevator car 22 to stop.
  • the example safety device 30 includes a sensor 40 supported by the housing 32.
  • the sensor 40 detects the position of the brake member 34 and provides an indication when the brake member 34 moves into the braking position.
  • the brake member 34 comprises a roller and is illustrated in a braking position.
  • the sensor 40 includes a portion 44 within the housing 32 for detecting when the brake member 34 is in the braking position.
  • the sensor 40 comprises a proximity sensor that detects when a distance from the portion 44 and the brake member 34 is great enough to provide an indication that the brake member 34 has moved into the braking position (i.e., away from the switch portion 44).
  • a known proximity sensor is used in one example.
  • Figures 4A and 4B illustrate another example arrangement where the sensor 40 comprises a limit switch.
  • the portion 44 of the sensor 40 supported within the housing 32 comprises a plunger that moves responsive to the presence or absence of the brake member 34 adjacent the sensor 40.
  • the mass of the brake member 34 rests upon the plunger 44 moving it downward (according to the drawing).
  • the plunger 44 moves relative to another portion of the sensor 40 and activates the switch so that the sensor 40 provides an indication that the brake member 34 has moved into the braking position.
  • Figure 5 illustrates another example safety device arrangement in which there are a plurality of brake members 34.
  • the brake members 34 are wedge-shaped. At least one sensor 40 is provided for detecting the position of at least one of the brake members 34.
  • the sensor 40 is supported by the housing 32 such that a portion of the sensor 40 is positioned relative to the housing 32 in a location where it can directly detect the position of the brake member 34. This allows for the sensor 40 to provide a direct indication of the position of the brake member 34. This is an improvement over arrangements that rely upon detecting an orientation or condition of a linkage member associated with activating an elevator safety device. By directly detecting the position of the brake member 34, the illustrated examples provide a more accurate and reliable indication regarding the condition of the safety device 30 and, in particular, the position of the brake member 34. [00023] The preceding description is exemplary rather than limiting in nature.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)
  • Cage And Drive Apparatuses For Elevators (AREA)

Abstract

An exemplary elevator safety device includes a housing. A brake member is moveably supported by the housing for selective movement between a disengaged position and a braking position. A sensor is supported by the housing and detects movement of the brake member into the braking position.

Description

ELEVATOR SAFETY DEVICE
BACKGROUND
[oooi] Elevator systems are useful for carrying passengers, cargo or both between various levels of a building. The speed at which an elevator car moves depends upon operation of the machine (e.g., motor and brake). When the system is functioning as expected, machine operation results in a desired elevator car speed.
[0002] There are various conditions during which an elevator car may move faster than desired. There are known devices for detecting such over speed conditions. For example, governors are useful for monitoring elevator car speed.
Under some conditions, a governor will trigger a safety braking operation to bring the elevator car to a stop.
[0003] Elevator safety devices provide a braking function that is separate from the braking capability of the machine (e.g., the machine brake). Such elevator safety devices typically include a brake member that directly engages a surface on the guiderails along which the elevator car moves. There are various known elevator safety device configurations.
[0004] One aspect of utilizing elevator safety devices for stopping the elevator car includes providing some indication that the safety device has engaged the guiderail. This is useful to initiate stopping the machine so that it does not attempt to continue to move the elevator car.
[0005] Current arrangements include a switch and a cam attached to a moving part along the linkage that is associated with the governor for moving the braking element of the safety device into a braking position. For example, a switch may be attached to the crosshead of an elevator car frame with a cam bracket associated with a connecting rod that moves responsive to operation of the governor. As the governor rope pulls on the linkage to engage the safety braking element with the guiderail, the switch detects motion of the connecting rod of the linkage through the cam. In this manner the switch is able to provide a signal to the machine controller for stopping the machine.
[0006] One drawback associated with this approach is that it requires field adjustment. Installation and adjustment is time consuming and subject to human error. Secondly, there are conditions in which the switch does not provide a true indication of the condition of the safety device. For example, it is possible for the crosshead linkage to reset even though the braking element of the safety device is not reset. In some cases, it is possible for the braking element of the safety device to be engaged with the guiderail even though the safety device has not been activated by the governor.
SUMMARY
[0007] An exemplary elevator safety device includes a housing. A brake member is moveably supported by the housing for selective movement between a disengaged position and a braking position. A sensor is supported by the housing and detects movement of the brake member into the braking position.
[0008] An exemplary method of monitoring an elevator safety device includes providing a sensor on the housing of the safety device. A determination is made when the brake member has moved into the braking position responsive to an indication from the sensor.
[0009] The various features and advantages of the disclosed examples will become apparent to those skilled in the art from the following detailed description. The drawings that accompany the detailed description can be briefly described as follows.
BRIEF DESCRIPTION OF THE DRAWINGS
[oooio] Figure 1 schematically illustrates selected portions of an elevator system.
[oooii] Figure 2 is a perspective illustration of an example elevator safety device designed according to an embodiment of this invention.
[oooi2] Figure 3 is a cross-sectional view taken along the lines 3-3 in Figure 2. [oooi3] Figures 4A and 4B schematically illustrate two operating conditions of another example sensor device.
[oooi4] Figure 5 schematically illustrates another example sensor device.
DETAILED DESCRIPTION
[oooi5] Figure 1 schematically shows selected portions of an elevator system 20. An elevator car 22 moves along guiderails 24 responsive to operation of a machine (e.g., motor and brake) (not illustrated). Elevator guides 26 facilitate movement of the car 22 along the guiderails 24 in a known manner.
[oooiό] Elevator safety devices 30 are supported for movement with the elevator car 22 and are selectively operated to stop the elevator car 22. [oooi7] Referring to Figures 2 and 3, one example safety device 30 includes a housing 32. A brake member 34 is supported by the housing 32 so that the brake member 34 is selectively engaged with a corresponding portion of a guiderail 24 that is received within a channel 36 formed in the housing 32. The brake member 34 follows a contour 38 formed on the housing 32 as the brake member 34 moves between a disengaged position in which the brake member 34 does not contact the guiderail 24 and a braking position in which the brake member 34 engages the guiderail 24 to cause the elevator car 22 to stop. As shown in Figure 2, a link 39 is used for coupling the brake member 34 to a governor actuating mechanism for purposes of moving the brake member 34 into the braking position when desired. [00018] The example safety device 30 includes a sensor 40 supported by the housing 32. The sensor 40 detects the position of the brake member 34 and provides an indication when the brake member 34 moves into the braking position.
[oooi9] In the example of Figures 2 and 3, the brake member 34 comprises a roller and is illustrated in a braking position. The sensor 40 includes a portion 44 within the housing 32 for detecting when the brake member 34 is in the braking position. In this example, the sensor 40 comprises a proximity sensor that detects when a distance from the portion 44 and the brake member 34 is great enough to provide an indication that the brake member 34 has moved into the braking position (i.e., away from the switch portion 44). A known proximity sensor is used in one example.
[00020] Figures 4A and 4B illustrate another example arrangement where the sensor 40 comprises a limit switch. In this example, the portion 44 of the sensor 40 supported within the housing 32 comprises a plunger that moves responsive to the presence or absence of the brake member 34 adjacent the sensor 40. In this example, as shown in Figure 4A, the mass of the brake member 34 rests upon the plunger 44 moving it downward (according to the drawing). When the brake member 34 is moved into the braking position as shown in Figure 4B, the plunger 44 moves relative to another portion of the sensor 40 and activates the switch so that the sensor 40 provides an indication that the brake member 34 has moved into the braking position. [00021] Figure 5 illustrates another example safety device arrangement in which there are a plurality of brake members 34. In this example, the brake members 34 are wedge-shaped. At least one sensor 40 is provided for detecting the position of at least one of the brake members 34. [00022] In each of the example safety devices, the sensor 40 is supported by the housing 32 such that a portion of the sensor 40 is positioned relative to the housing 32 in a location where it can directly detect the position of the brake member 34. This allows for the sensor 40 to provide a direct indication of the position of the brake member 34. This is an improvement over arrangements that rely upon detecting an orientation or condition of a linkage member associated with activating an elevator safety device. By directly detecting the position of the brake member 34, the illustrated examples provide a more accurate and reliable indication regarding the condition of the safety device 30 and, in particular, the position of the brake member 34. [00023] The preceding description is exemplary rather than limiting in nature.
Variations and modifications to the disclosed examples may become apparent to those skilled in the art that do not necessarily depart from the essence of this invention. The scope of legal protection given to this invention can only be determined by studying the following claims.

Claims

CLAIMSWe claim:
1. An elevator safety device, comprising: a housing; a brake member moveably supported by the housing for selective movement between a disengaged position and a braking position; and a sensor supported by the housing that detects movement of the brake member into the braking position.
2. The device of claim 1, wherein the sensor comprises a switch that provides an indication when the brake member moves into the braking position.
3. The device of claim 2, wherein the switch has a portion within the housing in close proximity to the brake member when the brake member is in the disengaged position.
4. The device of claim 3, wherein the portion of the switch is activated responsive to movement of the brake member into the braking position.
5. The device of claim 3, wherein the portion of the switch is activated responsive to a loss of contact with the brake member.
6. The device of claim 2, wherein the switch comprises a limit switch.
7. The device of claim 2, wherein the switch comprises a proximity switch.
8. The device of claim 1, wherein the brake member comprises a roller.
9. The device of claim 1, wherein the brake member comprises a plurality of wedges and the sensor detects movement of at least one of the wedges.
10. The device of claim 1, wherein the brake member is configured to engage a guide rail in the braking position.
11. A method of monitoring an elevator safety device that has a brake member supported by a housing for selective movement between a disengaged position and a braking position, comprising the steps of: providing a sensor on the housing; and determining when the brake member has moved into the braking position responsive to an indication from the sensor.
12. The method of claim 11, wherein the sensor comprises a switch that provides the indication when the brake member moves into the braking position.
13. The method of claim 12, comprising providing the indication responsive to movement of the brake member into the braking position.
14. The method of claim 12, comprising providing the indication responsive to a loss of contact between a portion of the switch and the brake member.
15. The method of claim 11, wherein the brake member is configured to engage a guide rail in the braking position.
EP09840907.1A 2009-02-25 2009-02-25 Elevator safety device Not-in-force EP2389333B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2009/035075 WO2010098747A1 (en) 2009-02-25 2009-02-25 Elevator safety device

Publications (3)

Publication Number Publication Date
EP2389333A1 true EP2389333A1 (en) 2011-11-30
EP2389333A4 EP2389333A4 (en) 2012-08-08
EP2389333B1 EP2389333B1 (en) 2018-09-19

Family

ID=42665767

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09840907.1A Not-in-force EP2389333B1 (en) 2009-02-25 2009-02-25 Elevator safety device

Country Status (5)

Country Link
US (1) US20110308895A1 (en)
EP (1) EP2389333B1 (en)
CN (1) CN102333716B (en)
ES (1) ES2700659T3 (en)
WO (1) WO2010098747A1 (en)

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Publication number Priority date Publication date Assignee Title
CN104428231B (en) * 2012-06-29 2016-09-07 因温特奥股份公司 elevator equipment
WO2014035382A1 (en) 2012-08-29 2014-03-06 Otis Elevator Company Friction brake assembly with an abradable metal foam brake pad
WO2015038116A1 (en) 2013-09-11 2015-03-19 Otis Elevator Company Braking device for braking a hoisted object relative to a guide member
JP6807753B2 (en) * 2014-06-12 2021-01-06 オーチス エレベータ カンパニーＯｔｉｓ Ｅｌｅｖａｔｏｒ Ｃｏｍｐａｎｙ Brake member drive mechanism
US10494227B2 (en) * 2014-06-12 2019-12-03 Otis Elevator Company Braking system resetting mechanism for a hoisted structure
US10112803B2 (en) * 2016-04-01 2018-10-30 Otis Elevator Company Protection assembly for elevator braking assembly speed sensing device and method
US11434104B2 (en) 2017-12-08 2022-09-06 Otis Elevator Company Continuous monitoring of rail and ride quality of elevator system
EP3643666B1 (en) * 2018-10-26 2021-04-28 Otis Elevator Company Elevator system
US20220250872A1 (en) * 2019-08-29 2022-08-11 Dynatech, Dynamics & Technology, S.L. Electromechanical activation of a unidirectional emergency stop device for a lift
US11597631B2 (en) * 2021-05-18 2023-03-07 Otis Elevator Company Magnet assemblies of electromechanical actuators for elevator systems having encapsulated switch
US11821580B2 (en) * 2021-06-03 2023-11-21 Wurtec, Incorporated Elevator guide rail block assembly
CN113860113B (en) * 2021-08-30 2023-02-14 伟龙意程智能科技(江苏)有限公司 Eccentric wheel type safety gear structure for elevator
CN119212942A (en) * 2022-05-26 2024-12-27 戴纳泰克动力与科技有限公司 Compact electromechanical actuation system for elevator safety gear

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JP3090809B2 (en) * 1993-03-05 2000-09-25 株式会社東芝 Self-propelled elevator
KR960008456Y1 (en) * 1993-06-11 1996-10-02 엘지산전 주식회사 Magnetic brake device for elevator car
US5366045A (en) * 1993-09-03 1994-11-22 Eaton Corporation Brake mechanism for a storage and retrieval vehicle
US6173813B1 (en) * 1998-12-23 2001-01-16 Otis Elevator Company Electronic control for an elevator braking system
ATE273915T1 (en) * 2000-06-22 2004-09-15 Inventio Ag BRAKE DEVICE WITH ADJUSTMENT OF BRAKING FORCE FOR ELEVATOR
TW513374B (en) * 2000-12-08 2002-12-11 Inventio Ag Safety brake with retardation-dependent braking force
JP2004262652A (en) * 2002-09-23 2004-09-24 Inventio Ag Safety device for elevator
JP2004256189A (en) * 2003-02-24 2004-09-16 Mitsubishi Electric Corp Elevator brake control device
WO2004083090A1 (en) * 2003-03-18 2004-09-30 Mitsubishi Denki Kabushiki Kaisha Emergency stop device for elevator
IL186678A0 (en) * 2006-11-16 2008-02-09 Inventio Ag Brake equipment, lift installation, a method for detecting a function of the brake equipment, and a modernisation set

Also Published As

Publication number Publication date
WO2010098747A1 (en) 2010-09-02
EP2389333B1 (en) 2018-09-19
CN102333716A (en) 2012-01-25
CN102333716B (en) 2016-06-08
EP2389333A4 (en) 2012-08-08
US20110308895A1 (en) 2011-12-22
ES2700659T3 (en) 2019-02-18

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